[Python] How can I add some form of verification to block users from inputting numbers or...

It is for a college project. I have got the main part of it done, but I want to add some sort of verification of what will be my teachers' input, I know he will try putting in random numbers and spamming a single letter. I have got number blocking to work with while loops but don't know where to go from here to also include blocking a string shorter than three letters without my code getting messy.

I have tried defining a variable but didn't really know how to do it. Would something like this work?

if variable.isdigit() or len(variable) <= 3 == True:
print("That's not a valid input!")
print(f"{name}, what is your favourite animal?

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